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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/renderer_host/render_widget_host_input_event_router.h"
#include "cc/quads/surface_draw_quad.h"
#include "cc/surfaces/surface_id_allocator.h"
#include "cc/surfaces/surface_manager.h"
#include "content/browser/renderer_host/render_widget_host_view_base.h"
#include "content/common/frame_messages.h"
#include "third_party/WebKit/public/web/WebInputEvent.h"
namespace content {
RenderWidgetHostInputEventRouter::HittestDelegate::HittestDelegate(
const std::unordered_map<cc::SurfaceId, HittestData, cc::SurfaceIdHash>&
hittest_data)
: hittest_data_(hittest_data) {}
bool RenderWidgetHostInputEventRouter::HittestDelegate::RejectHitTarget(
const cc::SurfaceDrawQuad* surface_quad,
const gfx::Point& point_in_quad_space) {
auto it = hittest_data_.find(surface_quad->surface_id);
if (it != hittest_data_.end() && it->second.ignored_for_hittest)
return true;
return false;
}
RenderWidgetHostInputEventRouter::RenderWidgetHostInputEventRouter()
: active_touches_(0) {}
RenderWidgetHostInputEventRouter::~RenderWidgetHostInputEventRouter() {
owner_map_.clear();
}
RenderWidgetHostViewBase* RenderWidgetHostInputEventRouter::FindEventTarget(
RenderWidgetHostViewBase* root_view,
const gfx::Point& point,
gfx::Point* transformed_point) {
// Short circuit if owner_map has only one RenderWidgetHostView, no need for
// hit testing.
if (owner_map_.size() <= 1) {
*transformed_point = point;
return root_view;
}
// The hittest delegate is used to reject hittesting quads based on extra
// hittesting data send by the renderer.
HittestDelegate delegate(hittest_data_);
// The conversion of point to transform_point is done over the course of the
// hit testing, and reflect transformations that would normally be applied in
// the renderer process if the event was being routed between frames within a
// single process with only one RenderWidgetHost.
uint32_t surface_id_namespace =
root_view->SurfaceIdNamespaceAtPoint(&delegate, point, transformed_point);
const SurfaceIdNamespaceOwnerMap::iterator iter =
owner_map_.find(surface_id_namespace);
// If the point hit a Surface whose namspace is no longer in the map, then
// it likely means the RenderWidgetHostView has been destroyed but its
// parent frame has not sent a new compositor frame since that happened.
if (iter == owner_map_.end())
return root_view;
RenderWidgetHostViewBase* target = iter->second.get();
// If we find the weak pointer is now null, it means the map entry is stale
// and should be removed to free space.
if (!target)
owner_map_.erase(iter);
return target;
}
void RenderWidgetHostInputEventRouter::RouteMouseEvent(
RenderWidgetHostViewBase* root_view,
blink::WebMouseEvent* event) {
gfx::Point transformed_point;
RenderWidgetHostViewBase* target = FindEventTarget(
root_view, gfx::Point(event->x, event->y), &transformed_point);
if (!target)
return;
event->x = transformed_point.x();
event->y = transformed_point.y();
target->ProcessMouseEvent(*event);
}
void RenderWidgetHostInputEventRouter::RouteMouseWheelEvent(
RenderWidgetHostViewBase* root_view,
blink::WebMouseWheelEvent* event) {
gfx::Point transformed_point;
RenderWidgetHostViewBase* target = FindEventTarget(
root_view, gfx::Point(event->x, event->y), &transformed_point);
if (!target)
return;
event->x = transformed_point.x();
event->y = transformed_point.y();
target->ProcessMouseWheelEvent(*event);
}
void RenderWidgetHostInputEventRouter::RouteTouchEvent(
RenderWidgetHostViewBase* root_view,
blink::WebTouchEvent* event,
const ui::LatencyInfo& latency) {
switch (event->type) {
case blink::WebInputEvent::TouchStart: {
if (!active_touches_) {
// Since this is the first touch, it defines the target for the rest
// of this sequence.
DCHECK(!current_touch_target_);
gfx::Point transformed_point;
gfx::Point original_point(event->touches[0].position.x,
event->touches[0].position.y);
RenderWidgetHostViewBase* target =
FindEventTarget(root_view, original_point, &transformed_point);
if (!target)
return;
// Store the weak-ptr to the target, since it could disappear in the
// middle of a touch sequence.
current_touch_target_ = target->GetWeakPtr();
}
++active_touches_;
if (current_touch_target_)
current_touch_target_->ProcessTouchEvent(*event, latency);
break;
}
case blink::WebInputEvent::TouchMove:
if (current_touch_target_)
current_touch_target_->ProcessTouchEvent(*event, latency);
break;
case blink::WebInputEvent::TouchEnd:
case blink::WebInputEvent::TouchCancel:
DCHECK(active_touches_);
if (current_touch_target_)
current_touch_target_->ProcessTouchEvent(*event, latency);
--active_touches_;
if (!active_touches_)
current_touch_target_ = WeakTarget();
break;
default:
NOTREACHED();
}
}
void RenderWidgetHostInputEventRouter::AddSurfaceIdNamespaceOwner(
uint32_t id,
RenderWidgetHostViewBase* owner) {
DCHECK(owner_map_.find(id) == owner_map_.end());
owner_map_.insert(std::make_pair(id, owner->GetWeakPtr()));
}
void RenderWidgetHostInputEventRouter::RemoveSurfaceIdNamespaceOwner(
uint32_t id) {
owner_map_.erase(id);
for (auto it = hittest_data_.begin(); it != hittest_data_.end();) {
if (cc::SurfaceIdAllocator::NamespaceForId(it->first) == id)
it = hittest_data_.erase(it);
else
++it;
}
}
void RenderWidgetHostInputEventRouter::OnHittestData(
const FrameHostMsg_HittestData_Params& params) {
if (owner_map_.find(cc::SurfaceIdAllocator::NamespaceForId(
params.surface_id)) == owner_map_.end()) {
return;
}
HittestData data;
data.ignored_for_hittest = params.ignored_for_hittest;
hittest_data_[params.surface_id] = data;
}
} // namespace content
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